MAINTAINERS: change maintainers for macb Ethernet driver

MAINTAINERS: change maintainers for macb Ethernet driver

I would like to hand over the macb maintenance to Théo, as I'm unable to
keep up with the recent flow of patches for this driver. After speaking
with Claudiu, he indicated that he is in the same position as me.
To help with this work, Conor has agreed to act as a reviewer.

I was given responsibility for this driver years ago, and I'm glad to
see it continue with talented developers.

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260507120444.9733-1-nicolas.ferre@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>